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Constrained Motion : Intuitive Approach

Figure shows ...

Question

Figure shows four blocks that are being pulled along a smooth horizontal surface. The masses of the blocks and tension in one cord are given. The pulling force $F$ is:

50 N

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100 N

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125 N

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200 N

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Solution

The correct option is D $200 N$
$40 N + 30 N + 20 N + 10 N = 100 N$
the system is in equilibrium
So, $T_{1}$ (tension) $= F cos 60^{o}$
$100 N = \frac{F}{2}$
$F = 200 N$

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